Safe Material: These well-made hot tub mineral rods are made of quality ABS plastic and are sturdy and odorless. The minerals contained in it will not cause any harm to human body, please feel free to use. The mineral inside the hot tub mineral rod can effectively absorb some impurities in the water, creating a better and safer water environment for you to enjoy the spa. Features: Easy to Install * Hot spring mineral rods are not affected by heat and can be installed on your existing flow. Simply place the spa rod into the existing filter and let the new rod work. Natural Mineral Substance * Ensure that the spa has no odor, improve the performance of the spa, and bring you crystal clear, clean and fresh water without harmful chemicals. Suitable for Most Spas and Hot Tubs * Suitable for Jacuzzi tubs, inflatable tubs, niche tubs, walk-in tubs, whirlpool tubs, hot tub boats and the most easy-to-use standard tubs that only take seconds to install. Ideal Choice * Our hot tub rod spa is up to 500 gal /2000L. Using our spa cartridge, low maintenance and low cost, lasts up to 4-6 months, helping to save you time and cost. Natural Hot Spring Experience * The natural hot spring mineral paste can automatically add trace minerals in the hot spring, reduce impurities in the hot spring, make the water clearer and cleaner, and make you feel comfortable as if you are in a pure natural hot spring. Packing Including * 2 Pack Yellow Spa Filter Rod ONLY, Other accessories not included